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10 examples of evaporation in daily life with explanations?
why is evaporation called a surface phenomena
why do the doctors advise to put strips of wet cloth on thr forehead of a person having high fever?
why does steam cause more severe burns than boiling water
which gas controls burning
carbondioxide or nitrogen
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liquids have lower density than water but ice floats on water why
what is the meaning of fixed volume
Differentiate between gas and vapour..
why does the temp. remains constant during the melting of ice even thoug heat is supplied contiously?
Particles in steam at 100 C have more energy than water at the same temperature. Why?
why evaporation is called surface phenomenon?
Describe an activity to show that particles of matter are continuously moving.
what happens when a liquid is heated ?
explain why,ice at 0 degree celcius more effective in cooling than water at the same temperature?
WHICH ON THE FOLLOWING STATEMENT IS INCORRECT
(a)cooling is produced during melting
(b)temperature changes steadily on heating
(c)melting point of ice 0degree
(d)once melting starts,the temperature stays at 0 degree celcius until all the ice has melted
compare in tabular form, the properties of solid,liquids,and gases with respect: i)shape ii)volume iii)commpressibilty iv)diffusion v)fluidity or ridgidity
why do we see water droplets on the outer surface of a glass containing ice cold water
Although sugar is a solid it takes the shape of the container in which it's kept. Why?
what are the characteristics of the particles of matter???
Name two gases which are supplied in compressed form in homes and hospitals
write full form of the follwoling
Explain why we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.
is wind matter or non matter?
How to show the sublimation of ammonium chloride???
Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density. Also, please compare these properties with solids, liquids and gases.
Define latent heat of fusion
how can show that particles matter have spaces between them?
with the help of diagram explain in brief an activity to show that particles of matter are very small
(a)air is used to make inflate tyres.
(b)steel is used to make railway lines.
why does the temperature of a substance remain constant during its melting point or boiling point ?
activity to show that gases are highly compressible than solids and liquids ?
examples of application of evaporation used in our daily life
do an activity to show that particles of matter are very small beyond our imagination
Why does water boils at lower temperature at higher altitudes?
why do trees acquire more leaves during summer?
show the triangular flow diagram for the inter conversion of solid , liquid , gas
1. Why should curd and sour substances not be kept in brass and coppervessels?
Is burning of wood sublimation ? Do all solids get converted to liquid upon heating ?
give reason water at room temperature is a liquid
explain how human body maintains constant temperature of 37*C(degree celsius) even when outside temperature may be as high as 45*C(degree celsius)
Explain the interconversion of 3 states of matter in terms of force of attraction and kinetic energy of molecules.
A wooden table should be called a solid give reason
(a) Tabulate the
differences in the characteristics of states of matter.
(b) Comment upon the following: rigidity, compressibility, fluidity,
filling a gas container, shape, kinetic energy, and density.
water as ice has a cooling effect, where as water as steam may cause severe burns. Explain these observations.
is rubber band a solid.then why it changes its shape on streaching
with the help of a neat diagram explain the difference in arrangements of particlesin solids,liquids and gases.
name the solute and solvent of tincture of iodine
what type of clothes should we wear in summer why
Q.1 What is the temperature called at which a gas liquefies? What is the lowest possible temperature for liquefying any gas?
Explain with the help of activity the particulate nature of matter.
What are the adaptation of camel ?
describe an activity to show that matter is composed of particles
A substance has no no mass. can we regard it as matter or not??
how to download exam idea book for class9
What is the difference between Gas and Vapour?
10 g of ice at -10 degree Celsius is added to 10 g of water at 85 degree Celsius. What is the final temperature and amount of ice left in the system?
State 2 characteristics of matter demonstrated by:
(b) brownian motion
why does the smell of the lighted incense stick reaches several metres away?
DIFFERENTIATE BETWEEN EVAPORATION AND BOILING.
GIVE 2-3 POINTS
A crystal of copper sulphate dissolve quickly in hot water than in cold water ?
The valency of sulphur in SO2 and SO3 is 4,6. Pls explain how?
Find the degree of hardness (in ppm) of the water if the 9.6 mg of MgSO4 present in 1 kg of water.
4 substances that sublime
How will you justify that ice , water and steam are the three states of a substance and not different substances?
Why the boiling is known as the bulk phenomenon ?
why should we wear cotton clothes in summer?
Choose the correct one --
When water boils , its temperature :
Also give reason for the chosen answer.
ICE AT 0 DEGREE CELCIUS APPEARS COLDER TO THE MOUTH THAN WATER AT 0 DEGREE CELCIUS.WHY?
how does applying pressure help in liquefaction of a gas?
what is the difference between evaporation and cooling
a gas exerts pressure on the walls of the container?why?how?
Give reason why we can easily move our hands in air but not through liquid or solid?
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